Load leveler for power scoops



Nov. 30? 1948 B. R OW I 2,455,160

LOAD LEVELER F011. POWER scoors Fi led Oct. 18,1946

'atented Nov. 30,3948

UNITED STAT S PA E OFFICE:

SClalms. (01. 73-426) This invention .pertains to load levelers-forowerscoops.

Heretofore, aggregates for cement mix were aeasured by hand shovels orscoops, or by measuring boxes of predetermined proportions. Iince theadvent of the power scoop, attached to he front of a small tractor,manual handling of .ggregates is unnecessary and undesirable. The rowerscoop is used to pick up and convey agrregates from the supply pile tothe mixer apron. loads taken by impact on the power scoop, however,vary, due to unavoidable differences in loadng conditions, such as theheight of the supply iile, moisture content, etc. In order to secureiroperly proportioned mixes it is necessary to se- :ure uniform loadingof the scoop. It is con- ;idered impractical to load the scoop uniformly2 Figure 2, is a side sectional view thereof. Similar numerals referto'similar parts in the several views.

The scoop body i is provided with guide channels 2 positioned, as shown,a desired distance from its bottom on each of its side plates to receivethe-ends of screed bar 3. This is attached to the bottom of a verticallyextending rod 4 pivotally attached by a bearing block 6 to a yoke 1,which, in turn, is pivoted to the side plates of the scoop by bolt pinsii, and acts as a supporting link.

A spring 8 normally urges the bar 3 toward the rear of the, guides 2where it is retained until forced forward by a pull on cable attached tothe top of rod d. When this cable is pulled toward the rear of the scoopthe rod d pivots on :ach'tim-e, however, I have found that if the I:coop is over loaded, it is possible to screed oil. ".he excess load andleave a uniform remainder if the material in the bottom of the scoop.This remainder can be controlled by the position and action of thescreed as it moves over the top of v the load, thus removing the excessfrom any given scoop load, a uniform volume may be selected and this maythen be mixed with the proper proportion of cement to attain a uniformIn view of the foregoing, one of the objects of my invention is toprovide a scoop for power operated attachment to utility tractors whichwill receive an impact load of aggregrates in excess of a predetermineddesired load and upon operation of a screed bar within the body of thescoop, reject all but a predetermined desired portion of said load.

A second object is to provide a scoop for power shovels, attached toutility trucks, having a screed bar operative as a sweep within the bodyof the scoop and controlled by mechanism actuated from the operator'scompartment in the truck.

A third object is to provide a utility truck elevating scoop with aleveling screed bar, operative by pivotally mounted levers, and withsliding motion controlled by guides within the body of the scoop.

Other objects will appear hereinafter.

I attain the foregoing objects by means of the devices shown in theaccompanying drawings, in which:

Figure 1 is a perspective view of a power onerated scoop, of the typeattached to a utility truck or tratcor, with my load leveling deviceincorporated; and

its supporting bearing 6 and yoke] swings downward so that bar 3 willmove along the channel guides 2. This motion is against the tension ofspring8 and as soon as pull on the cable is released the bar returns tothe inner end of guides 2.

An apron it may be added to extend above bar 3 if desired; Scoop l isattached to the elevating track of a utility truck by arms 9 and ill inthe usual manner, and the customary dumping mechanism (not shown) isused in the manner well known to the art.

In use, a load of sand or aggregate is taken by lowering the scoop, andforcing it into the supply pile by forward motion of the truck. Thescoop is then raised above the pile and the leveling mechanism operatedby pull cable t. This screeds off the excess aggregates above thepredetermined level indicated by guides 2 and governed by their distancefrom the bottom of the scoop, and levels the load on the scoop to aknown amount. The leveled load may then be carried to the mixer andmixed with the proper proportion of cement.

Having fully described my invention and explained its use I wish to belimited only by the followingclaims. a

I claim:

l. A load leveler for power operated scoops comprising, in combination,a, scoop body having a bottom, sides, guide channels on the inner facesof said scoop sides a predetermined distance from said bottom, a screedher having its ends slidably operative in said guide channels so thatits lower edge moves in a plane a predetermined distance above saidscoop bottom and having an upwardly extending apron, a link yoke pivotedto the sides of said scoop body, a vertically extending operative rodattached to said screed bar pivotally mounted on said link yoke, and aspring operative between said screed bar and the rear portion of saidscoop body, adapted to normally retain said bar in inoperative positionat the inner end oi said guides. and means for drawing the top of saidoperative bar toward the rear of the scoop body.

2, A load ieveier for power operated scoops,

' comprising, in combination, a scoop having a bottom, side plates, anopen front and a'raised back, horizontal guide channels on the innerfaces of said side plates, positioned a predetermined distance abovesaid bottom, a horizontal screed bar having a superposed apron, with itsends slidably operative in said guide channels above said scoop bottom,a link yoke pivotally supported on the sides of said scoop, a verticallyextending operative rod attached to the middle of said screed bar andpivotally mounted on said link yoke, and a spring normally holding saidscreed bar in a retracted position to the rear oi said guides, saidoperative rod extending above said pivotal link yoke mounting and havingan operative pull cable attachment thereon.

3. A load leveler for power operated scoops including, in combination, ascoop adapted to be mounted on a power truck, said scoop'having a on thesides oi said scoop body,

flat bottom, an open front and an elevated back and sides, guides formedon the inner faces of said sides a predetermined distance above saidscoop bottom, a screed bar having its ends operatively supported in saidguides so that its lower edge will move in a plane above said scoopbottom,

REFERENCES CITED The following references are of record in the file-ofthis patent:

UNITED STATES PATENTS Number Name Date 304,939 Kohler Sept. 9, 1884678,272 Neumayer July 9, 1901 993,560 Skyum May 30, 1911 1,567,320 Davis-5.-- Dec. 29, 1925

